Orthokeratology (Ortho-K, also known under branded names like “Nightlens” and “Nachtlens®” (from NKL), is the use of rigid gas-permeable contact lenses, normally worn only at night, to improve vision through the reshaping of the cornea. This method can be used as an alternative to eyeglasses, refractive surgery, or for those who prefer not to wear contact lenses during the day (for example, because lenses may become dislodged during sport.)

Advantages of wearing Ortho-K lenses:

1. It is a safer and reversible option versus refractive surgery.

2. Freedom from visual correction during the day and excellent vision to undertake all sorts of activities.

3. Minimized allergy and dry eye problems and no more dust particles.

4. Right and left lenses in different colors to avoid mistakes.









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